An investigation by the Daily News reveals documents showing that at least 100 teachers and principals were caught cheating to boost test scores in New York City public schools since 2006. Specifically, the reports show that teachers and administrators allowed extra time, gave students answers, or altered answer sheets to inflate scores on Regents exams as well as state math and reading tests. The tests are used to determine which students receive diplomas, which schools stay open or close, and which teachers receive bonuses.